Recorder
US7158641B2 · kind B2 · utility
2Cited by
5References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 29, 2000 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Mar 9, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/605
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A memory card (110) decodes data delivered to a data bus (BS3) and extracts a session key (Ks1) sent from a server from the data. Based on the session key (Ks1), an encrypting section (1406) encrypts a public encryption key (KPm (1)) of the memory card (110) and delivers it to a server through the data bus (BS3). The memory card (110) receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm (1)) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K(1)), and stores it in a memory (1415).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.